#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
char* mystrstr(const char* a,const char* b )
{
	while (a != '\0')
	{

	}

}
int main()
{
	char a[] = "abcdbde";
	char* ptr = strstr(a, "bd");
	printf("%s", ptr);
	return 0;
}